Heat Pump Control Unit Power Supply 230 V; Compressor Power Supply 400 V - Viessmann VITOCAL 242-G Installation And Service Instructions Manual

Installation sequence
Power supply
(cont.)
In negotiations with your power supply utility, differ-
■
ent supply tariffs for the main power circuits may be
offered.
Observe the technical connection conditions of the
power supply utility.
If the compressor and/or instantaneous heating
■
water heater are operated at an economy tariff
(power-OFF), either provide an additional cable (e.g.
2
3 x 1.5 mm ) for the power-OFF signal from the dis-
tribution board (meter box) to the heat pump control
unit.
Or
Combine the cables for the power-OFF signal and
for the heat pump control unit power supply
2
(3 x 1.5 mm ) in a 5-core cable.
■ The assignment of the power-OFF (for compressor
and/or instantaneous heating water heater) is made
via the type of connection and by setting parameters
in the heat pump control unit.
In Germany, the power supply can be cut off for up to
3 x 2 hours per day (24 h).
■ The heat pump control unit/PCB must be supplied
without power-OFF. Tariffs subject to possible shut-
down must not be used here.

Heat pump control unit power supply 230 V~

X3 X2
6
7
8
9
16
16
18
F1 T6,3AH
L1 N
Fig. 24

Compressor power supply 400 V~

L1
L2
3/N/PE
L3
400 V/50 Hz
N
Fig. 25
■ Fuse protection in accordance with the compressor
rating (see "Specification").
■ Economy tariff and power-OFF can be applied.
30
X1
N
N
3
1 1
L1
L2
L3
N
PE
In conjunction with on-site power consumption (use
■
of power generated by the PV system to meet own
requirements):
During the power-OFF period, it is not possible to
operate the compressor with power generated on
site.
Protect the power cable to the heat pump control unit
■
with an MCB/fuse of max. 16 A.
■ For accessories and external components that are
not to be connected to the heat pump control unit,
connect the power supply on the same phase as the
heat pump control unit; we recommend using the
same MCB/fuse.
Connection to the same MCB/fuse provides addi-
tional safety when the power is switched off.
Observe the power consumption of the connected
consumers.
■ The PE wire of the power cable must be approx.
10 mm longer than the N and L wires.
Note
This supply must never be blocked.
■ Max. fuse rating 16 A
■ Standard tariff (no economy tariff with power-OFF
possible)
■
Recommended power cable: 3 x 1.5 mm
2
(5 x 1.5 mm with power-OFF)
■ No parameters need to be set when using economy
tariff with power-OFF. The compressor is shut down
during the power-OFF time.
Recommended power cable:
■
2
5 x 2.5 mm
Max. cable length:
25 m
2